Electric ceiling-fan.



E. MARELLI'.

1,000,183. Patented Aug. 8, 1511.

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AYPLIUATION FILED MAR. 23, 1908.

PATENT @FFTCE.

ER-COLE MARELLI,

OF MILAN, ITALY.

ELECTRIC CEILING-FAN.

To all whom it may concern;

Be it known that T, EnooLn MARELLI, a subject of the King of Italy, residing at No. 10 Via S. Radegonda, Milan, in the Kingdom of Italy, have invented new and useful Improvements in Electric Ceiling- Fans, of which the following is a specification.

The present invention relates to improvements in electric ceiling fans, and particularly to fans of the type specified adapted to be actuated by an alternating current, the invention residing primarily in the production of a ceiling fan wherein the blades are attached to a combined casing and armature mounted on a stationary hollow shaft. This construction differs materially from the ordinary type of fan in which the casing is stationary, the blades being secured to the projecting lower end of the armature shaft. Such arrangement, however, is defective in that a relatively large air-gap exists between the armature and magnet, that a perfect adjustment of the armature and magnet is ordinarily impossible and that the shaft re quires constant lubrication, with the consequent danger of the oil rising and being sprinkled about the room in which the fan is located. These defects are avoided in the present construction in which the magnet is completely inclosed by the casing, and the electrical connections and the magnetic fields are stationary, and in which a hollow stationary shaft is employed, such shaft enabling either an are light or cluster to be attached to the lower end thereof, the conducting wires passing through its interior or bore.

The figure appearing in the accompanying drawing represents a sectional elevation of the preferred embodiment of the in- Vention.

Reference being had to said drawing, and to the characters marked thereon, A designates in a general manner the field magnet, B the vertical shaft to which the latter is secured, and G the combined casing and armature.

The magnet A, which may have either triphase or single phase windings, is completely inclosed by the casing, the latter be ing suitably subdivided, (in three parts according to the present construction), in

Specification of Letters Patent.

Application filed March 23, 1908.

Patented An 8, 1911.

Serial No. 422,830.

' order to facilitate the mounting of the magnet, the armature proper being connected to the central part, as shown.

The element O, termed hereinafter the rotor is formed with a pair of collars E, E through which shaft B loosely passes, the lower collar E resting upon a step bearing G with which an oil cup F is provided, said cup being fitted upon the threaded lower end of the shaft. The upper collar E has a portion thereof extending within the interior of the rotor and projecting into a second oil-cup F carried by the shaft. Both collars are notched, as indicated by the letter f, the notches on the lower collar preventing the oil within cup F from rising along the outer surface thereof and from being sprinkled outside of said cup from centrifugal force.

Shaft B, which is hollow as well as stationary, provides a passage through which and through an opening communicating therewith, the conducting wires a and b are led to the magnet, the wires, during their passage being connected to the binding posts a and Z). Hence, these wires are completely protected, and since they are stationary, will thus be maintained for a long period in a state of perfect insulation. The magnetic fields are likewise stationary, and for this reason, the current supply is facilitated. The employment of a hollow stationary shaft further permits the attachment of either an are light or cluster to the lower end thereof, the conducting wires (Z and e passing through the shaft bore. Illustration of such attachment has, however, been omitted for the reason that itmay be of any conventional type.

The rotor, as above stated, is constructed in sections removably connected together for the purpose of obtaining an accurate adjust-- ment or positioning of the armature and magnet. The central section is formed with a series of radial openings in which the inner ends of the fan blades D are fitted.

What is claimed is:

An electric ceiling fan comprising in combination, a stationary shaft; a magnet secured thereto; a casing rotatably mounted on said shaft and completely inclosing said magnet; a pair of oil-cups secured to said shaft, one of said cups being arranged em teriorly and the other interiorly of the cas- In testimony whereof I have signed my mg; a pair of collars formed upon said casname to this speclfication 1n the presence mg and pro ecting into sald cups, one cup of two subscribing Witnesses.

being provided with a bearing noon Which ERCOLE MARELLI. 5 the adjacent collar rests; an armature lo- Vitnesses:

cated Within said casing; and a series of B. CARLO SAINOTER,

blades secured to said casing. I l M. SEARSDORFER, J r.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

